Each arrow is a force (in newtons, N) pushing the box.
Add the ones on the same axis: opposite ones subtract.
A diagonal force (↗, at 45°) pushes along both axes, but only about 7/10 of its value on each: 50 N on a diagonal is about 35 N sideways and 35 N up or down.
The net force tells you which way it moves — or if it stays still.
If they all cancel out, it is balanced and does not move.
Chain correct answers: a streak gives extra points per answer.